This poor hen has parchment like stuff wrapped around her quills. I thought for a long time her feathers were chewed but I think it's some sort of mite. I've dusted with pyrethium several times as I've seen the wheat color lice on her skin. No signs of those but today I looked more closely and when I scratched the white stuff it came off like dry skin. Can you help me figure this out and what to do to help her?